<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
</head>
<body>
  <script>
    Array.prototype.MySome = function(callback)  {
      for(let i = 0; i <this.length; i++){
        if(callback(this[i],i,this)) return true

      }
      return false

    }
    let arr = [1,5,7,8,4]
    const res = arr.MySome((item) => {
      return item> 0
    })
    console.log(res);
  </script>
</body>
</html>